Guild Wars 2

I have a couple questions about Infiltrator’s Return that I haven’t seen asked and may make or break the skill. (By that I mean, not completely obliterate S/x)

1) At what point of the cast will Infiltrator’s Return’s teleport occur? At the beginning or the end?

2) Will the user be able to walk during the cast or is it like D/P 3 used to be?